INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Hong Zhang,Xin Zhang,Bo Wang,Bo Ren,Xiaodong Yang
Food spoilage leads to plenty of food being wasted every year. Safe and multifunctional food preservation packaging is urgently required to prevent food from contamination. Chitosan/gallic acid/Fe 3+ (CSGA-Fe 3+ ) composite films were synthesized by incorporating gallic acid (GA) and Fe 3+ into a chitosan solution. The integration of GA forms covalent and hydrogen bonds with chitosan, whereas Fe 3+ addition establishes metal-ligand interactions with both chitosan and GA, resulting in a film characterized by a multi-crosslinked network structure. This multi-crosslinked system substantially enhanced the material's mechanical properties and increased resistance to oxidation and ultraviolet degradation. The data indicate that the mechanical strength of chitosan/gallic acid (CSGA) films, with an inclusion of 0.3 mmol of GA, improved by 37.5 % over pure chitosan (CS) films. Moreover, the mechanical strength of the CSGA-Fe 3+ films saw a significant increase of 124.2 %, escalating from 1.32 MPa to 17.72 MPa. Additionally, the free radical scavenging capacities of the CSGA and CSGA-Fe 3+ films rose by 279.4 % and 255.0 %, respectively, compared to the pure CS film. The UV-blocking efficacy of the CSGA-Fe 3+ films, evaluated at 365 nm, reached 84.9 %. The water contact angle of the CSGA-1.5Fe 3+ film increased by 18.08 % compared to the CS film. This study provides innovative ideas to promote the broader application of safe and multifunctional chitosan-based composite films in food preservation packaging.
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高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2025
·
IF 5.2
Chunli Li,Zikai Zheng,Shiren Huang,Sujin Zheng,Linyun Zeng,Masrur Khodiev,Utkirjon Holikulov,Mekhrdod S. Kurboniyon,Chunyan Zhou,Jialiang Pan,Xinguo Zhang
Carbon dots (CDs), as emerging fluorescent carbon nanomaterials, boast exceptional optical properties and hold significant potential for various applications. In this study, novel dual-emissive red carbon dots (R-CDs) were synthesized from o -phenylenediamine (oPD) and 2, 2′-dithiobisbenzoic acid (DTSA) in ethanol, exhibiting emission wavelengths at 600 and 650 nm and a high photoluminescence quantum yield (QY) of 30.64 %. Notably, R-CDs exhibit excellent photostability, solvent-dependent fluorescence, and excitation wavelength-independent fluorescence properties. Based on liquid chromatography-mass spectrometry (LC-MS) and the 1 H nuclear magnetic resonance spectra ( 1 H NMR), the luminescent mechanism of R-CDs was systematically investigated to verify that 5,14-dihydroquinoxalinolo[2,3-b] phenazine (DHQP) is the fluorophore of R-CDs and a possible structural formation pathway has been proposed. For application testing, R-CDs demonstrated high sensitivity and selectivity toward Pb 2+ and Fe 3+ , exhibiting good linearity in the concentration ranges of 0–40 μM and 0–60 μM, with the detection limits (LOD) of 0.086 μM and 0.265 μM, respectively. Due to their polarity sensitivity, R-CDs can function as fluorescent sensors for detecting water content in organic solvents. Meanwhile, according to the sensitivity of R-CDs to Fe 3+ , an on-off-on fluorescent sensor was developed to detect F − , L-cys and EDTA with LOD of 9.446, 0.413 and 0.078 μM, respectively. Therefore, this study not only develops novel dual-emissive red carbon dots, but also establishes the foundation for the subsequent advancement of fluorescent sensors.
研究领域:
材料科学
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分析化学
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纳米技术
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环境传感
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荧光光谱学
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Yuyan Zheng,Meiling Chen,Xiaoqin Jiang,Xiangting Zhao,Shu Mi,Wenhua Miao,Yadong Zhao,Jin Zhu,Fei Liu
Herein, we propose the homogeneous synthesis of cellulose acetoacetate (CAA) by taking advantage of a CO 2 switchable solvent system. A nucleophilic carbonate cellulose intermediate was in situ formed during the dissolution process, which could initiate the grafting of diketone (DK) directly onto the cellulose backbone through Michael addition. A series of CAA samples with degree of substitution ( DS ) values ranging from 0.18 to 0.74 were prepared by adjusting different reaction conditions such as temperature, time, and the feeding ratio of DK. In addition, metal ion colorimetric test paper was prepared using the good solubility of the CAA sample, which can achieve selective color response to Fe 3+ ions. This study further confirms the feasibility of novel cellulose derivatives by Michael addition in the CO 2 switchable solvent system. And it also indicates that CO 2 switchable solvents have great potential for functionalization of cellulose.
研究领域:
高分子化学
·
绿色化学
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分析化学
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材料科学
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MINERALS ENGINEERING
·
2025
·
IF 5
Wenxin Hua,Jingzhong Kuang,Zheyu Huang,Lei Wang,Man Chen,Chenyang Zhang,Mingming Yu,Lingguo Meng
The flotation separation of scheelite and calcite remains an industrial challenge due to their similar surface properties and active sites, making the development of efficient novel depressants crucial for achieving separation. This study investigates the effect of Fe 3+ -pyrogallol (Fe-PA) complex depressants on the flotation separation of scheelite and calcite, exploring the mechanism by which complex structural stability governs the selective depression of minerals. Flotation results demonstrate that, compared to PA alone, Fe-PA complexes exhibit significant depression of calcite flotation while minimally affecting scheelite flotation; with increasing molar ratio of Fe 3+ to PA in the complexes, the grade and recovery of scheelite initially increase then decrease, reaching optimum values at a Fe 3+ :PA molar ratio of 1:2, thereby enabling effective separation of scheelite from calcite. UV–Vis absorption spectroscopy, automatic potentiometric titration, and DFT calculations collectively reveal that the molar ratio of Fe 3+ to PA critically influences complex stability: at the 1:2 ratio, complex absorbance plateaus, stepwise stability constants maximize, the O-Fe bond order peaks, the HOMO-LUMO energy gap widens maximally, and overall Fe-PA complex stability is highest. This enhanced stability directly impacts flotation separation, evidenced by negative adsorption energies of Fe-PA complexes on calcite versus positive values on scheelite; specifically, the 1:2 complex achieves the most negative adsorption energy on calcite, primarily due to its formation of a hydrophilic surface via an octahedral coordination configuration where two O atoms from surface CO 3 2– groups bond with O-Fe in the complex, thereby depressing calcite.
研究领域:
矿物加工工程
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冶金物理化学
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表面与界面化学
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配位化学
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资源综合利用
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Polymers
·
2021
·Vol. 13
·期 24
·4317
·
IF 4.329
Xinxin Wang,Yanan Zhao,Ting Wang,Yan Liang,Xiangzhong Zhao,Ke Tang,Yutong Guan,Hua Wang
As lactoferrin (LF) plays an essential role in physiological processes, the detection of LF has attracted increasing attention in the field of disease diagnosis. However, most current methods require expensive equipment, laborious pretreatment, and long processing time. In this work, carboxyl-rich carbon dots (COOH-CDs) were facilely prepared through a one-step, low-cost hydrothermal process with tartaric acid as the precursor. The COOH-CDs had abundant carboxyl on the surface and showed strong blue emission. Moreover, COOH-CDs were used as a fluorescent sensor toward Fe3+and showed high selectivity for Fe3+with the limit of detection (LoD) of 3.18 nM. Density functional theory (DFT) calculations were performed to reveal the mechanism of excellent performance for Fe3+detection. Meanwhile, COOH-CDs showed no obvious effect on lactobacillus plantarum growth, which means that COOH-CDs have good biocompatibility. Due to the nontoxicity and excellent detection performance for Fe3+, COOH-CDs were employed as a fluorescent sensor toward LF and showed satisfying performance with an LoD of 0.776 µg/mL, which was better than those of the other methods.Keywords:carbon dots;DFT calculations;Fe3+;lactoferrin;fluorescent sensor
研究领域:
分析化学
·
生物医学工程
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
·
IF 3.131
Hao Guo,Ning Wu,Rui Xue,Hui Liu,Li Li,Ming-yue Wang,Wen-qin Yao,Qi Li,Wu Yang
A pillar-like 3D lanthanide-organic framework (Eu-MOF) with opposite chirality was assembled according to previous report and fully characterized. The Eu-MOF exhibits excellent luminescence and structural stability in the aqueous solution or other organic solvents and good pH-independent luminescence stability in the pH range of 3–12. It is important to point out that the as-synthesized Eu-MOF can be developed as a highly selective and sensitive luminescent probe to rapidly detect Fe 3+ (detection limit, 0.39 μM) and Al 3+ (detection limit, 0.084 μM) from mixed metal ions , which can be explained by different response mechanisms and the color change are visible to the naked eyes under UV-lamp. In addition, it also exhibits highly sensitive for nitrobenzene (NB) (detection limit, 0.013 μM). Considering the obvious spectral response and low limit detection, the Eu-MOF can be employed as a promising multi-functional luminescent sensor for sensing metal ions and small organic molecules in the future.
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JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
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2016
·
IF 3.958
Tao Meng,Pengfei Xie,Hengfei Qin,Huan Liu,Weiming Hua,Xi Li,Zhen Ma
Xie et al. reported that Fe 2 O 3 /SiO 2 spheres with a surface area of 111 m 2 /g could be hydrothermally transformed into Fe 2 O 3 /Silicalite-1 nanowires in the presence of ethylenediamine and triethylamine. The resulting material was found to be active for CO oxidation and N 2 O decomposition due to the presence of small (1–2 nm) Fe 2 O 3 nanoparticles [P.F. Xie et al., Microporous Mesoporous Mater. 200 (2014) 52–60; P.F. Xie et al., J. Mol. Catal. A 409 (2015) 50–58]. In the current work, commercial amorphous SiO 2 spheres with a low specific surface area of 9.5 m 2 /g were found to be transformed into amorphous SiO 2 nanowires via hydrothermal treatment at 200 °C, in the presence of a mixture of ethylenediamine, triethylamine, and Fe(NO 3 ) 3 , for several days. The Fe 3+ species, in the presence of ethylenediamine and triethylamine, not only catalyzed the morphological transformation of SiO 2 , but also got deposited onto the SiO 2 nanowires, forming supported Fe 2 O 3 nanoparticles (2–4 nm in diameter) upon subsequent calcination to remove the organic templates. For comparison, Fe 2 O 3 /SiO 2 spheres prepared by impregnation had big Fe 2 O 3 particles (as large as 50 nm). Both the SiO 2 supports and supported Fe 2 O 3 particles were characterized by various techniques. The catalytic performance was studied, using N 2 O decomposition, CO oxidation, and photocatalytic reduction of Cr(VI) as probe reactions. Implications of the findings are discussed.
研究领域:
材料化学
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纳米材料
·
催化
·
环境修复
·
无机合成
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Journal of Macromolecular Science Part B-Physics
·
2024
·
IF 1.2
Zeguang Yang,Zhi Gao,Hongwei He,Lan Jia,Fuyong Liu,Wenwen Yu,Yonggang Li
The polyethylene terephthalate (PET) fibers surfaces were modified by complexing tannic acid (TA)-iron ions (Fe3+) to form a metal skeleton structure on the fibers. In this system a large number of phenolic hydroxyl groups, epoxy groups and other active groups on the fibers surfaces can stabilize the metal skeleton structure and enhance the interfacial peeling performance between the fibers and the composite rubber matrix. The modified PET fibers were analyzed by scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and mechanical properties. The results showed that the peeling strength between the modified fibers and the rubber matrix was increased 45%. This method has the advantages of simple operation, mild conditions and low cost, which provides a new idea for the preparation of rubber/polyester fiber composites with excellent mechanical properties.
研究领域:
材料科学
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高分子科学
·
表面改性
·
复合材料
·
化学工程
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SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Xueyan Liu,Zhuo Chen,Rongsheng Gao,Chengyou Kan,Jianhong Xu
Recently, the colorimetric quantitative method based on a smartphone and red–green–blue (RGB) analysis is applied to provide rapid on-site monitoring of metal ions. To develop such a fluorescent and colorimetric chemosensor for Fe 3+ , the functionalized polyacrylamide hydrogel P(AM- co -MBA- co -RhBUEA) was synthesized by free radical polymerization on the basis of a rhodamine-based probe RhBUEA. The physicochemical properties and sensing behavior of the functionalized hydrogel were investigated by FTIR, SEM and fluorescence spectral analysis. And the effects of MBA and RhBUEA amount on gel content and swelling properties were explored. According to the recipe of 1.0 wt.% MBA, 2.0 wt.% RhBUEA to the total monomers, the fabricated hydrogel displayed excellent selectivity, sensitivity and reversibility for Fe 3+ sensing in the pH range of 4.95–8.02, with the detection limit of 0.088 μM for the fluorescent quantitative method and the response time less than 20 min, accompanied with a distinct color change. Owing to the integration of RGB analysis with colorimetric responses, the functionalized hydrogel permitted the convenient, simplified and rapid colorimetric quantitative detection of Fe 3+ with the detection limit of 1.1 μM, which avoids the need of sophisticated instruments and trained operators.
研究领域:
分析化学
·
环境科学
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ACS Applied Materials & Interfaces
·
2026
·
IF 7.8
Zhenyu Yan,Wenyu Gao,Junkai Wen,Biyue Xie,Jisheng Geng,Qiangqiang Jiao,Jia Liu
Ammonia (NH3) is a crucial basic raw material in agricultural and industrial production and is an ideal hydrogen carrier in future clean energy systems. The electrocatalytic synthesis of NH3 from nitrate (NO3RR) not only yields a green product but also addresses ecological pollution, serving as a mild alternative to the Haber–Bosch technique. Electrolyte cations can significantly influence the kinetics, selectivity, and energy barriers of electrocatalytic reactions by modulating the electrical double-layer structure, local electric fields, stability of reaction intermediates, and interfacial water structure. However, the influence of the electrode–electrolyte interface environment dominated by electrolyte cations is often overlooked. This study first prepared a NiFe-LS catalyst with low-spin active centers through orbital modulation and subsequently verified the effects of three different cations (Li+, Na+, and K+) on the NO3RR from aspects including charge density, intermediate interaction, and solvation effects. The results indicate that K+ has the most significant promoting effect on NH3 synthesis. The Faraday efficiency (FE) reaches a maximum of 90.60% at −0.6 V vs RHE (0.1 M K2SO4 + 500 ppm of NO3–), with a corresponding yield of 10911.11 μg/h/mgcat.. Mechanistic analysis indicates that the presence of K+ can promote the breakage of the N–O bond, reduce the reaction energy barrier, inhibit the hydrogen evolution reaction (HER), and increase both the interfacial electrostatic potential and the electron transfer from the catalyst to NO3–. This study elucidates the mechanism by which cations enhance the activity of the electrocatalytic interface and reveals the significance of the local reaction environment on the electrode surface for NO3RR, contributing to the further development of novel electrolytes and catalysts.
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高影响因子
iScience
·
2026
·Vol. 29
·期 8
·
IF 4.5
Hairong Zhao,Chen Yang,Shuangyan Bao,Shuanglong Chen,Qingmo Yang,Yating Gai,Kangliang Lou,Heng Liu,Yang Li,Chenggui Zhang,Ruiqin Yang
Traditional chemotherapy for breast cancer faces limitations, including poor drug bioavailability, multidrug resistance, and severe systemic side effects. Therefore, a carrier-free nanodrug composed of Mastoparan M (Mast-M, derived from Wasp toxin), FDA-approved near infrared fluorescence dye (indocyanine green, ICG), and biosafe ion Fe 3+ was developed to achieve photothermal (PTT) and synergistic chemodynamic therapy (CDT)-assisted oxidation therapy. Once accumulated within tumor sites by enhanced permeability and retention (EPR) effects, the Mast-M/Fe 3+ /ICG rapidly dissociates in response to elevated glutathione (GSH), releasing Fe 2+ , ICG, and Mast-M. Mast-M efficiently triggers reactive oxygen species (ROS) generation to induce mitochondrial membrane potential disruption. Fe 2+ -mediated CDT further amplifies oxidative stress, accompanied by GSH consumption and lipid peroxide (LPO) accumulation. Under laser irradiation, ICG generates hyperthermia to enhance oxidative stress. In vitro and in vivo studies demonstrated enhanced antitumor efficacy with reduced systemic toxicity. Together, these findings highlight the potential of carrier-free nanodrugs for oxidative stress-based breast cancer therapy.
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JOURNAL OF PHYSICAL CHEMISTRY B
·
2026
·
IF 3.2
Wang Hongcan,Wei Yushuang,Lai Qin,Xu Cheng,Wang Meiying,Liu Hong,Li Guanmou,Yuan Bing
Boron-doped carbon quantum dots (BCQDs) exhibit attractive
optical
properties for sensing and bioimaging, yet the relationship between
synthesis conditions, surface chemistry, and fluorescence regulation
remains incompletely understood. Here, we demonstrate that the emission
behavior of BCQDs can be effectively tuned through temperature-controlled
solvothermal synthesis. Increasing the reaction temperature progressively
suppresses the intrinsic blue emission (450 nm) while enhancing a
defect-associated green emission (540 nm) without appreciably changing
the particle size. Spectroscopic characterization indicates that this
transition is accompanied by temperature-dependent surface chemical
evolution, including increased oxygen-containing functionalities and
reconstruction of heteroatom-containing surface states. Benefiting
from the defect-enriched surface, BCQD200 exhibits highly selective
fluorescence quenching toward Fe 3+ with a detection limit
of 50 nM. Spectroscopic, temperature-dependent fluorescence, and dynamic
light scattering analyses further suggest that Fe 3+ sensing
involves surface coordination accompanied by charge-transfer interactions
and BCQD-Fe 3+ assembly. These findings provide insights
into how synthesis-controlled surface chemistry regulates the photophysical
properties and sensing performance of boron-doped carbon quantum dots,
offering an effective strategy for developing high-performance fluorescent
nanoprobes.
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